JP3286357B2 - Charger - Google Patents
ChargerInfo
- Publication number
- JP3286357B2 JP3286357B2 JP27426492A JP27426492A JP3286357B2 JP 3286357 B2 JP3286357 B2 JP 3286357B2 JP 27426492 A JP27426492 A JP 27426492A JP 27426492 A JP27426492 A JP 27426492A JP 3286357 B2 JP3286357 B2 JP 3286357B2
- Authority
- JP
- Japan
- Prior art keywords
- charging
- current
- secondary battery
- time
- current value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000007600 charging Methods 0.000 claims description 37
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 238000010280 constant potential charging Methods 0.000 description 4
- 238000010277 constant-current charging Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、二次電池、特にリチウ
ムイオン二次電池等の非水系二次電池を定電圧充電する
充電器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charger for charging a non-aqueous secondary battery such as a lithium ion secondary battery at a constant voltage.
【０００２】[0002]
【従来の技術】繰り返し充電することにより複数回にわ
たって使用できる二次電池の中で、特にリチウムイオン
二次電池は、ニッケルカドミウム電池に比べて電圧が約
３倍も高く、しかも高容量である性質を有し、最近注目
されている。2. Description of the Related Art Among secondary batteries that can be used a plurality of times by repeated charging, lithium ion secondary batteries, in particular, have a voltage about three times higher than nickel cadmium batteries and have a high capacity. And has recently been receiving attention.
【０００３】ところで、斯る二次電池は、所定の電圧を
越えて過充電を行うと電池性能が低下してしまう。そこ
で、リチウムイオン二次電池では、所定電圧を越えて充
電されることがないように、通常、定電流・定電圧充電
が行われる。即ち、充電初期には定電流充電を行い、電
池電圧が設定値に近くなると、定電圧充電に切り替えて
いる（例えば、特開平４−１８３２３２号公報等参
照）。そして、充電電流がほぼ０になるか、あるいは所
定時間経過すると、満充電表示を行い、充電を終了す
る。[0003] When the secondary battery is overcharged beyond a predetermined voltage, the battery performance is degraded. Therefore, in a lithium ion secondary battery, constant current / constant voltage charging is usually performed so as not to be charged beyond a predetermined voltage. That is, constant-current charging is performed at the beginning of charging, and when the battery voltage approaches the set value, switching to constant-voltage charging is performed (see, for example, JP-A-4-183232). Then, when the charging current becomes substantially zero or a predetermined time has elapsed, a full charge display is performed, and charging is terminated.
【０００４】[0004]
【発明が解決しようとする課題】ところで、二次電池の
充電特性は、充電中の周囲温度により影響を受ける。図
３は、リチウムイオン二次電池において、周囲温度が０
℃、２５℃及び６０℃の場合の充電電流−充電時間の特
性を示している。Incidentally, the charging characteristics of a secondary battery are affected by the ambient temperature during charging. FIG. 3 shows that, in the lithium ion secondary battery, the ambient temperature is 0.
It shows the characteristics of the charging current-charging time at 25 ° C, 25 ° C and 60 ° C.
【０００５】同図から分かるように、充電時の周囲温度
により、満充電となって充電電流がほぼ０に収束するま
での時間は、大きく異なる。特に、低温（例えば、０
℃）状態で充電すると、充電電流がほぼ０に収束するま
での時間が非常に長くなる。その結果、ほぼ満充電とな
っているにも係わらず、長期にわたって満充電の表示が
なされず、非常に使い勝手がよくない。[0005] As can be seen from the figure, the time from the time of full charge until the charge current converges to almost 0 differs greatly depending on the ambient temperature during charging. In particular, low temperatures (eg, 0
C), the time required for the charging current to converge to almost 0 becomes very long. As a result, although the battery is almost fully charged, the display of the full charge is not displayed for a long time, and the usability is not very good.
【０００６】また、所定時間経過後に満充電表示する場
合には、充電時の周囲温度での充電特性が異なるため
に、満充電表示時点での充電量にバラツキが生じる。When full charge is displayed after a predetermined time has elapsed, charging characteristics at the time of full charge display vary due to different charging characteristics at ambient temperature during charging.
【０００７】そこで、本発明の目的は、充電時の周囲温
度に関係なく、適切に満充電表示を行うことにある。Therefore, an object of the present invention is to provide a proper full charge display regardless of the ambient temperature at the time of charging.
【０００８】[0008]
【課題を解決するための手段】本発明は、二次電池を定
電圧充電する充電器において、前記二次電池の充電電流
を検出する電流検出手段と、この電流検出手段により検
出された充電電流が第１の電流値から、この第１の電流
値より低い第２の電流値に低下するまでの所要時間に応
じて、満充電表示を行うまでの時間を算出する算出手段
とを備えたことを特徴とする。According to the present invention, there is provided a charger for charging a secondary battery at a constant voltage, comprising: a current detecting means for detecting a charging current of the secondary battery; and a charging current detected by the current detecting means. Calculating means for calculating a time until a full charge display is performed in accordance with a time required to decrease from the first current value to a second current value lower than the first current value. It is characterized by.
【０００９】[0009]
【作用】本発明によれば、充電電流が第１の電流値から
この第１の電流値より低い第２の電流値に低下するまで
の所要時間を認識することにより、間接的に充電中の二
次電池の周囲温度を、あるいは二次電池の容量を間接的
に測定する。そして、斯る所要時間に応じて、満充電表
示を行うまでの時間を算出し、適切な満充電表示を行
う。According to the present invention, the time required for the charging current to decrease from the first current value to the second current value lower than the first current value is recognized, thereby indirectly detecting the charging time. The ambient temperature of the secondary battery or the capacity of the secondary battery is measured indirectly. Then, according to the required time, the time until the full charge display is performed is calculated, and an appropriate full charge display is performed.
【００１０】[0010]
【実施例】図１は本発明の一実施例を示すブロック回路
図であり、１はＲＡＭ、充電制御プログラムや種々の充
電条件を記憶するＲＯＭ、マイクロコンピュータ及びそ
の他の周辺回路を備えた制御部、２はリチウムイオン二
次電池（以下、単に二次電池という）、３は商用電源
（図示していない）からの交流を受け、二次電池２に定
電流・定電圧の充電電力を供給する電源部、４は電源部
３からの電力を受け、二次電池２の電圧が所定電圧（例
えば、４．１Ｖ）になるまで、二次電池２に１Ｃ〜２Ｃ
の定電流を供給し、所定電圧到達後、二次電池２に４．
１Ｖの定電圧を供給する充電制御部、５は二次電池２の
充電電流Ｉを検出する電流検出部、６は充電の開始時か
ら時間のカウントを開始するタイマー回路、７はＬＥＤ
及びその駆動回路からなり、満充電表示時間になると、
満充電を表示する充電表示部である。FIG. 1 is a block circuit diagram showing an embodiment of the present invention. Reference numeral 1 denotes a control unit having a RAM, a ROM for storing a charge control program and various charge conditions, a microcomputer, and other peripheral circuits. Reference numeral 2 denotes a lithium ion secondary battery (hereinafter, simply referred to as a secondary battery). Reference numeral 3 denotes an alternating current supplied from a commercial power supply (not shown), and supplies constant-current / constant-voltage charging power to the secondary battery 2. The power supply unit 4 receives power from the power supply unit 3 and applies 1C to 2C to the secondary battery 2 until the voltage of the secondary battery 2 reaches a predetermined voltage (for example, 4.1 V).
Is supplied to the secondary battery 2 after reaching a predetermined voltage.
A charge control unit for supplying a constant voltage of 1 V, a current detection unit for detecting a charging current I of the secondary battery 2, a timer circuit 6 for starting counting time from the start of charging, and an LED 7
And its drive circuit, when the full charge display time is reached,
It is a charge display section for displaying full charge.
【００１１】図２は本発明の一実施例の動作を示すフロ
ーチャートである。ステップＳ１において、充電が開始
される。同時に、ステップＳ２において、タイマー回路
６はカウントを開始する。充電開始に伴い、充電制御部
４は、まず二次電池２の定電流充電を行い、二次電池２
が所定電圧に達すると、定電圧充電を行う。FIG. 2 is a flowchart showing the operation of one embodiment of the present invention. In step S1, charging is started. At the same time, in step S2, the timer circuit 6 starts counting. At the start of charging, the charging control unit 4 first performs constant current charging of the secondary battery 2 and
When reaches a predetermined voltage, constant voltage charging is performed.
【００１２】ステップＳ３において、電流検出部５によ
り検出される充電電流Ｉが、第１の電流値Ｉ１にまで低
下したか否かが判断される。今、第１の電流値Ｉ１にな
ったと判断されると、ステップＳ４において、その時の
タイマー回路６の第１のカウント値ｔ１が読み出され、
制御部１に一旦記憶される。In step S3, it is determined whether or not the charging current I detected by the current detecting section 5 has decreased to the first current value I1. If it is determined that the current value has reached the first current value I1, the first count value t1 of the timer circuit 6 at that time is read in step S4,
It is temporarily stored in the control unit 1.
【００１３】続いて、ステップＳ５において、電流検出
部５により検出される充電電流Ｉが、第１の電流値Ｉ１
から第２の電流値Ｉ２にまで低下したか否かが判断され
る。今、第２の電流値Ｉ２になったと判断されると、ス
テップＳ６において、その時のタイマー回路６の第２の
カウント値ｔ２が読み出され、制御部１に一旦記憶され
る。Subsequently, in step S5, the charging current I detected by the current detecting unit 5 is changed to the first current value I1.
Is determined to have decreased to the second current value I2. If it is determined that the current value has reached the second current value I2, the second count value t2 of the timer circuit 6 at that time is read out and temporarily stored in the control unit 1 in step S6.
【００１４】上記カウント値ｔ２が読み出されると、ス
テップＳ７において、制御部１は満充電の表示を行う時
間ｔ３を、ｔ３＝ｔ２＋ａ（ｔ２−ｔ１）の算出式にて
算出する。なお、ａは任意の定数（例えば、３）であ
る。When the count value t2 is read, in step S7, the control unit 1 calculates a time t3 for displaying the full charge by using a calculation formula of t3 = t2 + a (t2-t1). Note that a is an arbitrary constant (for example, 3).
【００１５】ここで、（ｔ２−ｔ１）は、充電電流Ｉが
第１の電流値Ｉ１から第２の電流値Ｉ２にまで低下する
に要した時間であり、この時間は、記述の如く、周囲温
度が高いほど短くなる。その結果、上述の算出式にて算
出される満充電の表示時間ｔ３は、周囲温度が高いほど
短くなり、換言すれば、周囲温度が高くなるほど満充電
に達する時間が短くなる二次電池２の特性に応じ、適宜
の時間に設定される。Here, (t2-t1) is the time required for the charging current I to decrease from the first current value I1 to the second current value I2, and this time is, as described, The higher the temperature, the shorter. As a result, the display time t3 of the full charge calculated by the above formula becomes shorter as the ambient temperature becomes higher, in other words, the time required to reach full charge becomes shorter as the ambient temperature becomes higher. It is set at an appropriate time according to the characteristics.
【００１６】そして、ステップＳ８において、タイマー
回路６のカウント値が上述で算出されたｔ３に達したか
否かが判断され、ｔ３に達したと判断されると、ステッ
プＳ９において、充電表示部７に満充電になったことが
表示される。In step S8, it is determined whether or not the count value of the timer circuit 6 has reached t3 calculated as described above. If it is determined that t3 has been reached, in step S9, the charge display section 7 is determined. Indicates that the battery is fully charged.
【００１７】[0017]
【発明の効果】本発明によれば、二次電池を定電圧充電
する充電器において、前記二次電池の充電電流を検出す
る電流検出手段と、この電流検出手段により検出された
充電電流が第１の電流値から、この第１の電流値より低
い第２の電流値に低下するまでの所要時間に応じて、満
充電表示を行うまでの時間を算出する算出手段とを備え
ているので、周囲温度を測定しないにも係わらず、周囲
温度に影響を受けることなく、適切な満充電表示を行う
ことができる。According to the present invention, in a charger for charging a secondary battery at a constant voltage, a current detecting means for detecting a charging current of the secondary battery, and a charging current detected by the current detecting means, are used for charging the secondary battery. And calculating means for calculating a time until a full charge display is performed in accordance with a time required to decrease from the current value of 1 to a second current value lower than the first current value. Even though the ambient temperature is not measured, an appropriate full charge display can be performed without being affected by the ambient temperature.
【図１】本発明の一実施例を示すブロック回路図であ
る。FIG. 1 is a block circuit diagram showing one embodiment of the present invention.
【図２】本発明の一実施例の動作を示すフローチャート
図である。FIG. 2 is a flowchart showing the operation of one embodiment of the present invention.
【図３】二次電池の充電特性を示す特性図である。FIG. 3 is a characteristic diagram showing charging characteristics of a secondary battery.
１ 制御部 ２ 二次電池 ５ 電流検出部 ６ タイマー回路 ７ 充電表示部 DESCRIPTION OF SYMBOLS 1 Control part 2 Secondary battery 5 Current detection part 6 Timer circuit 7 Charging display part
Claims (1)
て、前記二次電池の充電電流を検出する電流検出手段
と、この電流検出手段により検出された充電電流が第１
の電流値から、この第１の電流値より低い第２の電流値
に低下するまでの所要時間に応じて、満充電表示を行う
までの時間を算出する算出手段とを備えたことを特徴と
する充電器。1. A charger for charging a secondary battery at a constant voltage, wherein a current detecting means for detecting a charging current of the secondary battery, and a charging current detected by the current detecting means is a first current.
And calculating means for calculating a time until a full charge display is performed in accordance with a time required for the current value of (i) to decrease to a second current value lower than the first current value. Charger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27426492A JP3286357B2 (en) | 1992-10-13 | 1992-10-13 | Charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27426492A JP3286357B2 (en) | 1992-10-13 | 1992-10-13 | Charger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06133467A JPH06133467A (en) | 1994-05-13 |
| JP3286357B2 true JP3286357B2 (en) | 2002-05-27 |
Family
ID=17539253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27426492A Expired - Fee Related JP3286357B2 (en) | 1992-10-13 | 1992-10-13 | Charger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3286357B2 (en) |
-
1992
- 1992-10-13 JP JP27426492A patent/JP3286357B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06133467A (en) | 1994-05-13 |
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